How many positive four-digit integers have their digits in ascending order from thousands to units?

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Vincen: Legendary Member; Posts: 2898; Joined: Thu Sep 07, 2017 2:49 pmFollowed by: 5 members; Thanked: 6 times

by Vincen » Thu Mar 11, 2021 11:48 am

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How many positive four-digit integers have their digits in ascending order from thousands to units?

A. 6
B. 7
C. 84
D. 126
E. 210

Answer: D

Source: GMAT Club Tests

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Source: Beat The GMAT — Problem Solving | Thu Mar 11, 2021 11:48 am

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